About hvac system components
GRD stands for Grille, Register and Diffuser. GRD signifies a part is possibly a grille, a sign up or maybe a diffuser. It is just a generic phrase employed to describe everything that’s supply/return and exhaust/ingestion air.MFD stands for Motorized Hearth Damper. MFD is actually a style of damper that is each motorized and resistant to firepla